linux-kernel - Re: [PATCH v4 3/6] pwm: meson: generalize 4 inputs clock on meson8 pwm type

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Date: Wed, 24 Jan 2024 10:11:59 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Jerome Brunet <jbrunet@...libre.com>, Thierry Reding
 <thierry.reding@...il.com>, Neil Armstrong <neil.armstrong@...aro.org>,
 Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Kevin Hilman <khilman@...libre.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
 linux-pwm@...r.kernel.org, JunYi Zhao <junyi.zhao@...ogic.com>
Subject: Re: [PATCH v4 3/6] pwm: meson: generalize 4 inputs clock on meson8
 pwm type


On Wed 24 Jan 2024 at 10:08, Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:

> [[PGP Signed Part:Undecided]]
> Hello Jerome,
>
> On Fri, Dec 22, 2023 at 12:16:51PM +0100, Jerome Brunet wrote:
>> Meson8 pwm type always has 4 input clocks. Some inputs may be grounded,
>> like in the AO domain of some SoCs.
>> 
>> Drop the parent number parameter and make this is constant.
>> This is also done to make addition of generic meson8 compatible easier.
>> 
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> ---
>>  drivers/pwm/pwm-meson.c | 19 ++++++-------------
>>  1 file changed, 6 insertions(+), 13 deletions(-)
>> 
>> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
>> index 2971bbf3b5e7..ef50c337f444 100644
>> --- a/drivers/pwm/pwm-meson.c
>> +++ b/drivers/pwm/pwm-meson.c
>> @@ -60,7 +60,7 @@
>>  #define MISC_A_EN		BIT(0)
>>  
>>  #define MESON_NUM_PWMS		2
>> -#define MESON_MAX_MUX_PARENTS	4
>> +#define MESON_NUM_MUX_PARENTS	4
>>  
>>  static struct meson_pwm_channel_data {
>>  	u8		reg_offset;
>> @@ -98,7 +98,6 @@ struct meson_pwm_channel {
>>  
>>  struct meson_pwm_data {
>>  	const char * const *parent_names;
>
> I suggest to make this
>
> 	const char *parent_names[MESON_NUM_MUX_PARENTS];

Ok.

>
> to make it more explicit that really four entries are needed here. This
> also makes is unnecessary to add the additional NULL entries to
> pwm_gxbb_ao_parent_names and the other arrays.

I would normally agree but I'd prefer to be explicit.

There are some instance where the NULL is in the middle, this can't go
away. I think it looks if some inputs are explicitly NULL while the
other are implicit.

Of course, it is just a preference. I can remove these if that is
bothering you.

>
> Best regards
> Uwe


-- 
Jerome